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302 M. E. Lane and A. Rahma
https://t.me/med1917
and about 50–150 nm in length) in an in vivo mini pig study. Preparations were applied four times daily, 5 days a week for a total of 22 days. At the end of the study period, skin samples were analysed via TEM and Scannin g Electron Microscope­Energy Dispersive X-Ray spectroscopy, and blood samples were measured using Inductively Coupled Plasma Mass Spectrometry. All three types of NPs were concentrated in the SC layer. There was no evidence of follicular penetration and
e d
in th
ermis, only a few isolated NPs were observed.
Gulson et al. (2010) applied two types of ZnO NP to human volunteers: a preparation containing 19 nm NP or a vehicle containing 100 nm NP. Stable isotope tracing with
68
Zn was used to distinguish dermally absorbed Zn from endogenous Zn. Although Zn was detected in the blood after 5 days, it was not possible to determine whether the levels represented Zn absorbed as intact particles or soluble Zn or both. Van der Merwe et al. (2009) investigated the in vitro penetration of magnesium oxide (7 nm thickness, 100 to 200 nm in length) and TiO
particles
2
(<1 nm crystallites which aggregate into micron size particles of 5 μm) in dermatomed human skin. Application of the particles as a dry powder, water suspension, and suspensions with 0.2% w/v sodium lauryl sulphate (SLS) for 8 hours did not result in any absorption of the particles through the skin. Iron oxide (γ-Fe
) particles (5.9 nm) coated with tetramethyl ammonium hydroxide
2O3
(TMAOH) were evaluated in human skin in vitro by Baroli et al. (2007). Nanoparticles were observed to penetrate into the stratum corneum and hair follicles but did not permeate through the skin.
Mohammed et al. (2019) have studied the safety of repeated application of agglomerated zinc oxide (ZnO) NPs to human volunteers over 5 days. Skin pene­tration of intact ZnO NPs and
zinc ions was assessed using multiphoton tomography
with uorescence lifetime imaging microscopy. ZnO NPs accumulated on the skin surface and within the skin furrows but did not enter or cause cellular toxicity in the viable epidermis. Zinc ion concentrations in the viable epidermis of excised human skin were slightly elevated. The authors concluded that repeated application of ZnO NPs to the skin, as used in global sunscreen products, appeared to be safe with no evidence of toxicity in the viable epidermis. More recently, similar ndings were conrmed by Khabir and colleagues (2021). These authors quantied the relative concentrations of endogenous and exogenous Zn using a rare stable zinc-67 isotope after application of ZnO NPs to excised human skin. ZnO NPs were retained on the skin surface or conned to the outer layers of the skin; dissolved zinc species permeated across the SC into the VE as ionic Zn and not as ZnO NPs.
Metal Nanoparticles
The permeation of iron nanoparticles (4.9–23.3 nm) was evaluated in full-thickness human skin in vitro by Baroli et al. (2007) using a vertical diffusion cell experimen­tal design. Iron deposits were observed below the viable epidermis and within and proximal to the hair follicles; however, the NP did not permeate through the skin. Gold core particles with silica shell s (94 ± 6 and 161 ± 13 nm) and silica particles coated with a gold shell (298 ± 11 nm) were applied to human skin samples by Graf et al. (2009). Scanning transmission X-ray microscopy conrmed that particles with
12 Non-deformable Nanoparticles and Transdermal Penetration 303
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dimensions 161 ± 13 nm were observed in the supercial layers of the stratum corneum and hair follicles but no deeper penetration was observed. Filon et al. (2007) and Larese et al. (2009 nanoparticles (9.8–48.8 nm) presence of nanoparticles solely in the lower layers of the stratum corneum using Transmission Electron Microscopy. Samberg and co-workers (2010) evaluated in vivo porcine exposure to silver nanoparticles (20–50 nm) over 14 days at varying dosages. After 14 days of topical dosing, TEM conrmed that NP could only be found in the supercial l penetration of silver nanoparticles in pig and human skin. A mass balance study in human skin found that most nanoparticles were washed from the skin or remained in the stratum corneum.
Nanoparticles Fabricated with Polymeric Materials and Starch
Polymerized lactic acid (PLA) and polymerized glycolic acid (PGA) and the related co-polymer poly-lactide-co-glycolide (PLGA) are used to formulate implants and other injectable medicinal products. Various studies have investigated whether nanoparticles fabricated with these polymers might enhance (trans)dermal delivery of actives. Luengo and co-workers ( nanoparticles (mean size 328.2 nm). Enhanced transport and higher accumulation of uefenamic acid compared with unencapsulated drug was observed in excised human skin in Franz cell studies after ~24 h. Although particles were found homogeneously distributed on the skin surface and within the skin folds, no nanoparticles were detected within or between the corneocytes. The penetration and storage behaviour of 5-uoresceinamine-labelled PLGA nanoparticles (diameter 320 nm) in porcine skin in vitro and human skin in vivo was evaluated by Lademann et al. (2006, 2007). NP did penetrate deeply into the hair follicles of human skin but only penetrated the upper two layers of the SC. After 10 days, NP could still be detected in the hair follicles, but the residence time in the SC was only 24 h. However, in these experiments, the formulations were rubbed into the skin with a massage device rather than simply being applied to the skin sites and this is likely to contribute signicantly to the apparent uptake of the NP by the skin.
) investigated the percutaneous absorption of silver
in human skin in vitro. The authors reported the
ayers o
f the SC. Kraeling et al. (
2006) encapsulated ufenamic acid in PLGA
2018)
examined
the
in
vitro
Tsujimoto et al. (2007) investigated PLGA nanoparticles (205 nm) for delivery of hinokitiol to hair follicles. Using human scalp biopsy samples and confocal laser microscopy (CLM), the PLGA nanoparticles appeared to deliver more of the hinokitiol to a greater depth in the scalp. No permeation data were reported in the study. Rancan et al. (2009) investigated the penetration of uorescent dye-loaded PLA particles (228 and 365 nm) in human skin explants. Particles did not permeate the follicular epithelium to the viable tissue but did accumulate in hair follicles. Vettor et al. (2010) investigated the skin distribution of octyl-methoxycinnamate (OMC) from PLA nanoparticles compared with an OMC emulgel formulation using Franz cell diffusion studies. The amount of OMC released from NP to viable skin was threefold lower than from the emulgel but the fate of the NP was not evaluated.
The penetration prole of 40, 750, and 1500 nm uorescent polys tyrene NP in human skin samples was investigated by Vogt and co-workers (2006). NPs were
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Fig. 12.4 Schematic of interaction of NPs of different sizes on the skin
applied for 15–16 h at 37 °C. The larger particles aggregated in the hair follicle openings; only 40 nm particles entered the hair follicle openings and penetrated the follicular epit helium. Skin disposition and permeation of polystyrene and poly (methyl methacrylate) NP was examined in vitro using dermatomed porcine skin by Wu et al. (2009b
). The uorescent tag,
uorescein methacrylate (FMA), was used to label the polymers, and a second uorescent compound, Nile Red, was loaded into the particles. The mean diameter of the polystyrene NP was <50 nm while the poly (methyl methacrylate) NPs were approximately twice as large. In vitro skin perme­ation experiments were conducted over 6 h. While NPs did accumulate in skin furrows and on and around hair follicles, they did not penetrate beyond the outer skin
. I
layers
n a later study, the in on topical delivery of Nile Red to porcine skin was examined (Wu et al. Three poly-(ε-caprolactone)
uence
NP
particle size and polymer hydrophobicity
of
2009c).
(CAPA) formulations (90, 260, and 630 nm) loaded with NR were used to study the impact of particle size on delivery of the model active. The larger NPs were more efcient at delivering NR into the skin, presum­ably because of the larger area of exposure to the skin (Fig.
12.4).
In a late r study, Wu et al. (2010) investigated the interaction of three types of charged nanoparticles after application to porcine skin in vitro. NPs were formulated with a cationic amino-functionalized polystyrene (PS-[+]), an anionic carboxyl­functionalized polystyrene (PS-[-]), and an anionic PLA polymer (PLA-[-]). Particles were loaded with uorophore N-(2,6-diisopropylphenyl)perylene-3,4­dicarboximine (PMI). The cationic nanoparticles showed clear afnity for the negatively charged skin surface, in contrast to the anionic nanoparticles. The cationic NP also delivered a signicantly greater amount of the PMI into the SC. The afnity of NP for hair follicles was also conrmed.
Zou and colleagues (2017) studied the interaction of three different -sized poly­styrene NPs marked with red uorescence with human skin, with Calcium Green 5 N used as a counterstain. Dimethyl sulfoxide (DMSO) and ethanol were used as alternative vehicles for NPs. Tape stripping was utilized as a barrier-damaged skin model. Skin biopsies dosed with NPs were incubated at 4 °C or 37 °C for 24 h and imaged using confocal laser scanning microscopy. NPs were localized in the stratum corneum (SC) and hair follicles without penetrating the epidermis/dermis. Barrier alteration with tape stripping and change in incubation temperature did not induce deeper penetration. Using horizontal scanning by 2-photon microscopy (2 PM) of full-thickness human skin samples, Dogt and co-workers (2018) demon strated that
12 Non-deformable Nanoparticles and Transdermal Penetration 305
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uorescently tagged 20 and 200 nm polystyrene nanoparticles preferentially accu­mulated in the stratum corneum (SC) and in the upper part of vellus hair foll icles (HFs). Deeper penetration into the viable epidermis and HF infundibulum of 20 and 200 nm nanoparticles at sites of high focal parti cle aggregation was reported by the authors. However, it is important to note that this study used excised scalp skin and it is not clear if the method of preparation of the skin sampl tissue.
Santander-Ortega et al. (2010) formulated NP composed of propyl-starch deriv­atives of varying degrees of substitution (PS-1 and PS-1.45) and encapsulated three drugs (ufenamic acid, testosterone, caffeine) in the NP. Although drug permeation was observed for all NPs, this was not improved for testosterone and caffeine compared to permeation of drug alone and the authors did not investigate the fate of the NP in skin.
Quantum Dots and Fullerenes
Quantum dot NP (semiconductor nanocrystals) are inherently uorescent and are available in sizes <10 nm. The permeation of two types of quantum dot NPs in porcine skin in vitro (spherical NP with a diameter of 4.6 nm and ellipsoid NP with major axis of 12 n m and minor axis of 6 nm) was investigated by Ryman-Rasmus sen et al. (
2006). The NPs were also prepared with neutral, cationic, and anionic
coatings. Prior to application to porcine skin in diffusion cells, the NPs were suspended in borate buffer of pH 9 or pH 8.3. Neutral and anionic NPs were detected in the epidermis and cationic NPs were observed in the dermis using confocal microscopy imaging. The buffer systems may have contributed to skin damage during the experiment and are not representative of typical vehicles that are applied to human skin. The same group (Zhang et al. 2008) evaluated in vitro porcine skin permeation of nail-shaped quantum dot NP (QD621) composed of a cadmium/ selenide core, a cadmium sulphide shell, coated with PEG and with a hydrodynamic diameter of 39–40 nm. NPs were determined in the SC and in the supercial areas of the hair follicles after 24 h but not in the dermis. Jeong et al. (2010) applied QD under occlusion to the arm of human volunteers for 4 h. NPs were found in the SC layers after tape stripping but NP penetration of the SC was not demonstrated.
es may have damaged the
The interaction of cadmium telluride (CdTe) QD (~3.5 nm) with human skin in vitro was investigated by Gratieri et al. (2010). The effects of massaging and articial damage of the skin by tape stripping were also explored. Non-invasive multiphoton spectroscopy, CLM, and sectioning of the SC followed by CLM were used to evaluate QD depth proles. The formulation and skin were left in contact for 15 h before analysis. Although massaging the skin clearly altered the distribution of QD in the skin samp les, there was no evidence of penetration into the skin. Tape­stripped skin did indicate enhanced QD uptake (7 μm depth) into the skin.
Nastiti and colleagues (2019) examined the inuence of biological factors such as age and anatomical site on the penetration and distribution of 2.1 nm hydrophilic CdTe/CdS quantum dots: QDs in adult pig skin (APS), weanling pig skin (WPS), and new born pig skin (NBPS) at two different anatomical sites (ear and abdomen). After 6- or 24-h incubation on Franz diffusion cells, tape stripping of skin was
306 M. E. Lane and A. Rahma
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conducted. QDs were mainly localized in h air follicles after 6 and 24 h of exposure with no cadmium detected in the Franz cell receptor compartment regardless of pig age or anatomical site. The amount of QDs deposited in the follicles was similar at 6 h but higher on APS and WPS ears compared to NBPS ears at 24 h. This is associated with the high follicle density and small follicle diameter of the NBPS compared to the smaller density of much larger follicles on the APS. NBPS showed
onsis
tent QD distribution for ear and abdomen up to 24 h. The authors concluded
c that
there
min
imal penetration of QDs through pig skin.
is
Fullerenes are composed of carbon and may have spherical, ellipsoid, or tube-like structures. Rouse et al. (2007) synthesized a fullerene-substituted peptide (Carbon­BAA-Lys-[FITC]-NLS) and evaluated its penetration through exed and unexed porcine skin in vitro. After 60 or 90 min exing the skin was mounted in diffusion cells and percutaneous absorption was assessed over 8 and 24 h. Confocal micros­copy conrmed dermal penetration of the exed skin by 8 h but no dermal penetra­tion of unexed skin was observed until 24 h. Kato and co-workers (
2009) applied
three different doses of fullerene-60 in a squalene vehicle to human skin in diffusion cells for 24 h. Following tissue extraction and analysis, fullerene-60 was detected in the epidermis but not in the dermis. Xia et al. (
2010) applied pristine fullerenes in
mineral oil, toluene, cyclohexane, or chloroform to the dorsal area of pigs for 24 h. Fullerene was not detected in the skin when dosed in mineral oil but when dosed in toluene, cyclohexane, or chloroform, fullerene penetrated deeply into the skin. The rationale for selection of some of the solvents used in the study must be questioned because of their known ability to disrupt the skin lipids.
12.6 The Penetration of Nanoparticles in Human Skin:
A Theoretical Perspective
Assuming that NPs behave like large molecules, it is possible to estimate their rate of penetration using simp le diffusion theory (Watkinson et al. 2013). To demonstrate this approach, a hypothetical spherical molecule of molecular weight 500 and log K of 2 should be considered. Assuming a density of 1 g/cm be 500 cm
3
/mole and correcting for Avogadros number gives the volume of an
individual molecule 8.3 × 10
0.58 nm.
The Potts and Guy relationship, discussed in Sect. 3.2, relates permeation to an exponential function of molecular weight or molecular volume. This allows the prediction of permeability coefcients (k into aqueous solutions (Potts and Guy 1992), using the octanol water partition coefcient (K ) and the molecular weight (M). Even though this relationship was developed from a limited data set in terms of molecular weight (18–765), it should be possible to extrapolate to consider NP penetration. When some NPs of different diameters are considered and using the same approach as taken for the hypothetical
-22 cm3
3
, the molar volume will
. From this the estimated molecular radius is
) across the skin for chemicals dissolved
p
12 Non-deformable Nanoparticles and Transdermal Penetration 307
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Table 12.1 Predicted permeability coefcient values (k
) for NPs of varying dimensions calculated
p
from the Potts–Guy equation relationship
Particle diameter (nm)
1 5.2 × 10 2 4.2 × 10 5 6.6 × 10
Particle volume (cm
-22
-21
-20
Volume of 1 mole
3
)
particles (cm
3
)
Molar mass (g/mole)
log (k
/cm2 s
p
-1
) 315 315 -6.80 1.57E-07 2523 2523 -20.3 5.38E-21 39,419 39,419 -245 4.61E-246
(kp/cm2 s
-1
Assuming Log K of 2
Table 12.2 Predicted J
Particle diameter (nm)
Molar mass
(g/mole) 1 315 - × 10 2 2523 -40 8 × 10
values for NPs of various dimensions calculated using Eq. 12.2
max
log (J
max
91
/mol cm
-2 h-1
) J
/mol cm
max
-9
-41
-2 h-1
J
max
341 2 × 10
/ng cm
-28
-2 h-1
5 39,419 -560 0 0
Assuming Log K of 2
molecule the data in Table 12.1 can be generated. A further assumption is that the particles partition favourably into the skin with a log K value of 2 which is optimum for a molecule to partition across the heterogeneous structure of the skin and into the systemic circulation.
An alternative approach is to use the algorithm of Magnusson et al. (2004). In this
publication, the authors relate the maximum ux (J
/mol cm
max
-2 h-1
) across the skin to molecular weight. Considering the NPs of the same dimensions as for the previous calculation, this then allows the values reported in Table
12.2 to be
calculated for the maximum ux across the skin.
It is evident that as the size of the non-deformable NP increases, the amount that can penetrate the skin becomes increasingly small. Importantly, the two approaches to estimate the rates of permeation of nanoparticles are consistent but it is important to note that they are derived on the same types of data sets. It follows then that if penetration through skin of intact NPs occurs, then it is not a passive diffusion process.
)
12.7 Summary
In this chapter, the interaction of non-deformable NP with the skin has been reviewed. Most of the studies considered indicate that such NPs only permeate the supercial layers of the skin, that is, the SC. Very limited evidence is presented for epidermal penetration and dermal absorption. Where epidermal permeation was observed, it is generally associated with mechanical stress or relatively harsh
308 M. E. Lane and A. Rahma
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vehicles or where the skin is articially damaged. Follicular penetration is suggested as a possible route of non-deformable NP permeation. However, the hair shaft itself is known to move under normal in vivo conditions, and the extent to which this may inuence any possible follicular permeation needs to be carefully evaluated. A theoretical framework to understand the factors that determine and limit solid non­deformable NP penetration in the skin is consistent wit
h the experimental ndings
reported in the literature.
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